Britain's FTSE 250 slips on rising no-deal Brexit fears

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FTSE 100 up 0.2%, FTSE 250 down 0.3%

* Brexit fears hit domestic stocks

* Sterling weakness helps exporters gain

* Mid-cap Amigo sinks after forecast cut

Aug 29 (Reuters) - Britain's mid-cap index slid for the second straight session on Thursday after Prime Minister Boris Johnson's plan to suspend parliament raised the prospects of a no-deal Brexit, while the resulting weakness in sterling helped the exporter-heavy FTSE 100 eke out gains.

The main index added 0.2%, with gains led by more internationally exposed firms such as BAT and AstraZeneca. The more domestically-focussed FTSE 250 slipped 0.3% by 0709 GMT.

The mid-cap index was also pulled lower by a more than 17% slump in Amigo Holdings after the consumer credit provider posted lower adjusted pre-tax profit for the first quarter and cut its annual forecast. (Reporting by Shashwat Awasthi in Bengaluru; Editing by Arun Koyyur)